APA citiranje

Kunz, R. M. (1971). The challenge of life. Switzerland: Basel and Stutgart.

Trích dẫn kiểu Chicago

Kunz, Robert M. The Challenge of Life. Switzerland: Basel and Stutgart, 1971.

MLA citiranje

Kunz, Robert M. The Challenge of Life. Switzerland: Basel and Stutgart, 1971.

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